Method of distributing material



9, 1937. H. Y. SATTERLEE- I 2,098,887

METHOD OF DISTRIBUTINGMA'I'ERIAL Filed June 19, 1937 4 Sheets-Sheet 1 INVENTOR Henry-Kym) BY ATTORNEYd' Nov. 9, 1937. SATTERLEE 2,098,88T

METHOD OF DISTRIBUTING MATERIAL Filed June 19 19:57 4 shets sh et 2- T V TNVEN-RTR I, GAJ M I ATTORNEY? Nov. 9, 1937.

H. Y. SATTE- IRLEE METHOD OF DISTRIBUTING MATERIAL Filed June 19, 1957 4 Sheets-Sheet I5 .NVENTOR ,MQ- M ATTORNEYS Henry Kid/#6 3600 Ine- Nov. 9, 1937. H, Y, SAT TERLEI'E 2,098,887.

METHOD OF DISTRIBUTING MATERIAL Filed June 19,1957 4 Sheets-Sheet 4 IN\ IENTOR Hemy YJahenlee Patented N v. 9 1937 7 2 09838 7 I 2.098.887 ua'rnon or nrsramp'rnvc. MATERIAL Application im 19. 1937, Serial im tate-f s (cl. z t-13s) My invention relates to a. method of dispoisonous-tojn'sects. .A measure of success has rl u in ma er l fr m n aut giro during fli ht attended this practice but, at the same time, a V the eof. i q I nuinberiof objections arise with respect thereto. I My invention has particular reference to the Thus, an airplane necessarily travels at high art of distributing material from an autogiro speed in order to remain aloft and, when such in such manner that the application of the'maairplane is flown at very slight altitude close to terlal shall be efficient and desirable for the the growing crops, the danger of a resulting crash intendedpurpose I V is rvery real. Furthermore, thenecessary high It has been found that the distributing of speed of airplane travel is not conducive to the 0 materials such as in spraying. with the use of mosteflective spreading of the material and, ordinary airplanes is not so eflicient or satis- I moreover, such high speed renders itdiflicu-ltand factory but I have discovered that the air blast impractical to manoeuvre the airplane and produced by an autogiro, due particularly to the properly position it with respect to the growing. slip stream of the propeller and the down blast crops particularly in response to directions given 5 produced by I the ,rotor, are especially efllcie'nt by an observer on the ground. Furthermore the 15 and useful for this purpose. I cross-sectional shape of the slip stream of an Various other objectaadvantages and charor nary airplane'is not so well suited to spread .acteri'stics of my invention will become apparent materials from the air and also when the plane UNITED -sT Tasff PATEN'r'I OFFICE from the following detailed description. 'is flownat safe altitudes the slip stream does not I My invention resides in the method,' autog iro act to force the materials into' contact with sur distributing arrangement and features of the faces to be sprayed, and there is also much loss character hereinafter described and"clainied. from driftingin this way; These'and various I .This application is a continuation in part of other disadvantages are incident to the use of I 'my prior application Serial No. 1,345, flied Janairplanes forthe purpose noted above.

uary 11,1935- In accordance with the invention of this ap-' 5 For an understanding of my invention and for plication, an a'utogiroJs utilized for distributing an illustration of some of the various forms material such, for example, as particles of-liquid" thereof, reference is. to be had' to the accomor solid material so that such particles may panying drawings, in which: descend to ornear the level of the ground, onto Figure l is a side elevational view showing an growing crops or be otherwise utilizable as hereautogiro in the act of distributing'material; 1 inafter described.

I I Figs. 2-6 inclusive'are vertical sectional views For further explanation of the invention, reftaken approximately on the respective lines 2-2, erence is to be had to Fig. 1 wherein A represents n H, H. Hand 8.6 of"F ig. l; v a an autogiro. Asis well understood, a.machine Fig. 7 is a plan view illustrating the distributof this character comprises a fuselage .I from 8 Operation shown in 1; which projects the wing structure 2 if utilized,

1858 is a vertical sectional view, partly in the usual tractor propeller I being disposed at I I elevation, of an arrangement for distributing the front of the fuselage and aiframe 4 extendmaterlal from an aircraft during flight thereof; lng above said fuselage for the support of the 0 Fig. 9 is a horizontal sectional view, partly in usual rotor 5. The chassis frame structure 8 40 plan, and is taken on-the line 9-9 of Fig. 8; is disposed below .thefuselage I and carries the Fig. 10 is a vertical sectional view, partly in usual wheels I whereby themachine is supported elevation, and is taken on the line Ill-Ill of when resting'upon the ground. I

I 1 1g. 8; As one example of ,apreferred arrangement Fig. 11 is an elevational view showing 'an auto for passing liquid material into the slip stream giro in the actrof' distributing powder material; of the autogiro, reference is to be had to Figs. 1,

- Fig. 12 is a vertical sectional. view, partly in 8, 9 and 10 wherein a shaft 8- is shown as suitelevation, showing the bin and distributing arably positioned and mounted in suitable bear- -,rangement of Fig. 11; and v g ings 9 fixed, for example, to straps 9a, respec- Fig. 13 is a transverse, vertical. sectional view,- tively, which-are secured'to the fra i t t partly in elevation, and is taken on the line 5. Carried. by the forward end of the shaft 81s l3l3 of Fig. 12.' a suitable propeller ill which, preferably al- To someextent, during recent years, ordinary though not. necessarily, is a device known to the" airplanes have been used for such purposes as art as a De Bothezat fan,'.this fan comprising a the distribution onto growing crops of material plurality of suitably pitched blades Ilia. Carried by the shaft 8 at the end thereof opposite vanes llb 01 the structure II which may properly the propeller ID .is a structure II which ,comprises a flared skirt or conical section Ila from the interior surface of which'project a plurality 5 of vanes or Webs l lb extending approximately radially with respect to the shaft 8. Disposed,- preferably in concentric relation, around the shaft 8. is a feed tube l2 which, at its discharge end, communicates with the space defined in- 1 teriorly of the skirt section I la at the inner ends of the vanes II-b. Associated with the other end of/the feedtube [2 is a tubular member [3 which, interiorly of said feed tube l2, carries a closure plate l4 and a spinning ring arrangelfi/ment l5 utilizable for preventing passage of liquid material along the shaft 8 in a direction from left to right, Fig. 8. A locking sleeve I6 threaded to the tubular member l3 serves to maintain an anti-friction bearing arrangement''' I1 within the tubular member l3, said bearing arrangement .11 being included in one of the aforesaid bearings 9.

Upstanding from thefeed tube 2J5. a'tubular the lower end of the tube IS communicating with the feed tube l2and the upper end of said tube l9 being inclined asshown in Fig. 8 so as to form a valve seat. Coactable with said upperinclined,

end of the. tube l9 is avalve closure plate arrangement which; in the example shown, comprises a pairof plates 20between which is sandwiched a disk 2| formed from leather or other similar material, the plates 20 and the disk 2| being secured together by rivets 22 or the like.

The upper plate 20 has secured thereto a bracket 23 to which an arm 24 .is secured by a pin 25, the arm 24 having its lower end secured to a shaft 26 oscillatory in bearings formed-in said tubular structure l8. As shown in Fig. 9, one end 0 of an arm 21 is secured to that end of the shaft 26 which projects exteriorly of the tubular structure I8, the other end of said arm 21 having fastenecl thereto an actuating member 28 which extends to some position adjacent the seat of the autogiro pilot so as to be accessible for ready operation. Communicating with the tubular structure I8 is a'conduit 29 which leads to a tank or container Gil-suitably supported interiorly of the autogiro fuselage I, Fig. 1, the container. 30 having therein a supply of thematerial which is to be spread-during flight of. the autogiro.

' The material which is to be disposed within the container 30 may assume any one of a .va-

riety of iorms. Thus, or example, when liquid,

material is utilized, such liquid materialmay be a petroleum distillate utilizable as an insecticide. A more viscous material which has been used with success is a liquid spray formed by mixing pounds of leadarsenate with 25 gallons of 0 water and sixgallonsof oil. v

, I In operation, asupply of the selected materialto be sprayed is fed. into the; container 30 and then, with the parts arranged as shown in Fig. 8, the'autogiro is flown to the area which is to be 5 sprayed and, when in proper position, the operbe termed a spray disk.

As appears from a consideration of Fig. 1, the

sprayingarr angexnent of Fig. 8 is supported in the slip stream of the autogiro and, accordingly, during flight of theautogiro. the propeller Ill, by the action of the slipfstream, is rotated at high speed to thereby impart corresponding ro-.

tative movement to the spray disk I I. It results, therefore, that the above described material,

which spreads between the vanes ll b, is thrown or projected outwardly so as to be passed laterally into the slip stream of the autogiro and, as shown in Fig. l, the slip stream drives or deflects material to be distributedgenerally in the direction taken by said slip stream, this action being accompanied by divergence of such .ma-

terial as hereinafter described. When using viscous spraying material of the character noted above, it has been observed that such material is in sheet form when thus projected into the slip stream of the autogiro. It shall be understood, however, that the invention is not to be structure l8 having a tube I9 re-entrant therein, .limited in this respect.

During flight of the autogiro, as indicated in Figs. 1 and 2, there is alower section of the slip stream immediately adjacent the spray disk -I Pinto which the material is passed so as to be suspended or entrained therein, this lower slip-v stream section. being approximately circular intransverse, vertical section, Fig. 2. As the autogiro passes on, the down-draft produced .by the blades of the rotor 5 causes the slip stream produced by the propeller 3, to be flattened whereby the aforesaid approximatelycircular configuration thereof is changed to a configuration which is approximately elliptical in transverse, vertical section, Fig. 3. Further, the propeller 3 and the rotor 5' serve jointly to cause the suspended anaterial to diverge from that section of the autogiro. line of flight which was established at ape proximately the time said material was fed into the slip stream, the diverging slip stream ex-- -5'and 6, that the major axis of the elliptical section continues to lengthen after the autogiro passes on. That is, even thoughthe rotor 5 is no longer directly above the stream in which thematerial is suspended, the major axis of the aforesaid elliptical section continues to lengthen until the efiects of the propeller 3 and rotor 5 have been dissipated. Thus, by action of the propeller 3, and the" rotor 5, the material which is passed into, the slip stream fromthe spray disk II is dividedand subdivided so as to form small particles which are distributed throughout the slip streams In Fig. 1, the autogiro A isillustrated' as flying described I ator moves the actuating member 28 to thereby relatively close to the-ground level, as six feet, swing the arm'24 clockwise, Fig. 8, and openthe' I more or less. Under such circumstances, the a passage through the tube l9 to a desired extent. stream in which the particles of material are sus- Accordingly, under the influence of gravity, ma-,

' 0 terial descends from' the container 30, passes I d'owrrwardlythrough the conduit 29; the tubular structure I8, the tube I9 and then passes into the tube- H. In said-tube I2, the material=passes from right to left, Fig. '8, the material leaving- 7 the end'o'i the tube l2 and spreadingbetween-the pended is forced downwardly intoengagernent with the surface of the ground somewhat as indicated in said Fig. 1 although it often happens that the autogiro will have passed onward a'dis- -It is the autogiro rotor which forces the stream latter, for example, come into contact either with the lower surfaces of plants or other vegetation growing in the area under treatment or with insects feeding on such lower surfaces. By reason of the characteristic of the invention ,just described, it follows that insecticides, or equivalent, may be applied easily and conveniently to surfaces more. or less facing the ground, such surfaces heretofore having been reached with difficulty, if at all.

Although a particularly useful application of the invention has reference to the treatment of low growing vegetation as described, it shall be understood that there are various other important applications 'of the invention. Thus, for example,

byuny invention, forest trees or other relatively tall trees may readily be subjected to spraying, dusting or other operations.- With a treating operation of this character, itis desirable for the autogiro to fly ata suitable height, as twenty feet, more of less, above the tops of the trees. Under such circumstances, itwill be understood that the stream bearing the suspended material' does not engage the surface of the ground in the. manner described 'above. Rather,.such stream, after the autogiro passes on, continues moving downwardly, principally by reason of the previous thrusting action thereon by the autogiro rotor 5,

an example of such downward movement being shown at the left of Fig. 1 below the horizontal line indicating the surface of the ground. As a result, the suspended material is'positively driven downwardly into and through the trees whereby,

.for example, it engages the leaves on the trees or comes into' contact with insects feeding on such leaves. Because thus'driven into the trees, there is little drift of the cloud of spraying or dusting material such as often occursto great etc. These impulses are distinctly advantageous because creating swirls and eddies in the stream whereby the suspended material is eifectively applied to leaf and other surfaces which face ,in directions other than upwardly.

In accordance with my invention, it is highly desirable that, during the spraying, dusting or tween these lines is the angle of autogiro inclination, should be slow as compared with the usual flying speed of such machines. Thus, in practice, it has been established that a flying speed between thirty-five and forty-five miles per hour, for example, gives satisfactory results." More particularly, in connection with the flying speed of the autogiro together with the angle of flight thereof, it has been determined that excellent results are obtained when the engine is operated at a speed only slightly faster than the stalling speed. It

shall be understood. however, that theinvention is not to be limited to the preferred fly ng speeds described immediately above.

Operation of the autogiro at an angle to a horizontal surface as just described is important par-.'

ticularly for the reason that the slip stream carrying the particles of material is thereby directed more sharply at the vegetation or other rendering it possible for the autogiro to manoeuvre over areaswhich would otherwisebe inaccessible and, further, because enabling the angle of flight to be at a maximum.

It will be understood that the propeller l0 operates at a more or less variable ,speed, this being dependent upon the speed of' the autogiro. The invention relates to the use of such variable speed devices'and it also has reference to a spraying orsp'reading device which operates at constant speed or substantially so. Thus,,for example, the disclosed spray disk ll may be rotated at substantially constant speed by a device for driving electrical, generators at substantially constant speed during flight of an airplane, a device of this type being exemplified by the Deslauriers self-regulating constant speed air fan, the regulation of which depends on automatic change of the pitch of the fan "blade. Or, for example, the spray disk may be rotated at variable speed in the manner described in my aforesaid application Serial No. 1,345, filed January '11, 1935.

Referring to-Figs. 11, 12 and 13, the autogiro; A is shown as having a bin or hopper ll disposed in the fuselage thereof, this bin being adapted to contain a quantity of powdered or granular material such, for example, as pyrethrum dust, copper lime dust, sulphur powder, etc., etc. As illustrated in Fig. 12, the bin 4|! is provided with downwardly andinwardly sloping walls-ll, ll so as to thereby form a narrow passage 41 extendingthroughout the length of said bin 40. R0-

tatably mounted in the passage I2 is adrum 43 having a plurality of spaced ribs 44 disposed on the drum periphery, these ribs 44 extending longitudinally of the drum. Connected to the supporting shaft for the drum I3 is a flexible shaft 45 or other suitable driving means, this shaft 45, or equivalent, being rotated in any suitable manner, as by an electrical motor, a wind-driven propeller," etc.

Slidablymounted in suitable manner 'on the lower surface of the bifi bottom wall is a plate 46 utilizable for closing the aforesaid passage 42. Associated with the plate 46 .are the lever arms 41, 48 which are pivotally related to each other at 49, the arm 48 being. operated by a control member Sll which extends to a suitable location adjacent the seat of the autogiro operator.

Disposed below and secured to the bin 40 is a structure comprising side walls 5|, 5| Joined by a bottom wall 52 curved as shown in Fig. 12 so as to form a Venturi tube arrangement. It will be understood that this Venturi tube arrangement is so disposed that the open sides thereof move transversely with respebt to the line of flight.

In operation, as soonas the autogiro with the bin arrangement of Fig. 11 reaches an area to be dusted, the operator actuates the member 50 to thereby move the plate 46 to a desired open position, Then, with the drum l3 rotating at a desired speed, the particles of material pass downwardly through the lower open end of the passage 42 and enter the Venturi tube arrangement, where, at the proper high velocity, such particles of material are swept along by and in the slip stream of the autogiro. Under substantially the same flying conditions, it will be understood that hereinbefore described.

The drum 43 and the ribs 44 serve as a means for controlling the amount or volume of the powder'ed material which passes through the pasfor spreading an insecticide onto plant growth or other surfaces by the use of an autogiro presents numerous advantages over the prior art method of using an ordinary airplane.

Obviously, an autogiro may be manmuvred at relatively slow speed or even caused to hover over an areato be treated. This is a highly desirable factor from the viewpoint of safety of the pilot and machine. Then, too, this characteristic just as of autogiros of the tractor type as disclosed.

noted is highly advantageous because enabling the pilot toreadily take directions from someone on the ground who is in charge of the operation." Another desirable factor in connection with the use of autogiros for the,purpose stated resides in the fact that thebase of operations may often 'be much closer to the area to be treated than would be the caseif an airplane was utilized. This is necessarily true because an autogiro requires a'landing field of but limited extent whereas a much larger landing ileld is required for an airplane. An autogiroalso-permits manoeuvring about obstructions which may be in or around an area, to be sprayed. For example, an autogiro could spray in the corner of a field completely hemmed in by trees and reach parts of the field with a precision which could not be attained by an airplane;

Although the invention has beenv described above. in connection with the use of liquid and solid particles, it shall be understood that the invention \is not to be so limited. Thus, it shall be understood that seedsor other solid or liquid particles, alone or in combination with a liquid may be disseminated or spreadfrom an autogiro ;in a similar manner to that described above.

Likewise, it is to be understood that a gas maybe spread over an area in the manner hereinbefore described and that combinations of such materials, whether liquid, solid and/or gaseous may be chosen and utilized as desired.

An'important application of the present invention relates to the control of mosquitoes. When this phase of the invention is practiced, it will be understood that a suitable mosquito control agent, such as a petroleum distillate, is spread or ordinary airplane as well.

cast upon the water or other surface to be treats ed by an autogiro under the influence of its rotor operating in the general manner hereinbefore described.

The spray device and duster herein described are believed to be novel per se and although I have described their use with an autogiro, it is to be understood that it may be employed on an I Therefore, said spray device and duster are not to be restricted for use on autogiros.

It shall be understood that the invention is not to be limited to a spraying disk arrangement of any particular character. For all types of materials to be spread, the mechanism by which the same is introduced into the slip stream may be of different character within wide latitude. Thus,

under some circumstances, there may be utilized for this purpose, devices of the character known to the art for spreading material from ordinary airplanes. Furthermore, it shall be understood that the spreading mechanism need notnecessarily be operated by the rush of air caused by. flight of the autogiro. As well, such mechanism may be operated at any desired constant speed, for example, under storage battery control or, if desired,'the mechanism may be directly connected to the autogiro engine.

In Figs; 8, 9 and 10, I have illustrated an arraingement which serves in an advantageous manner as a sprayer of liquid material. It shall be understood that this arrangement is not to be thus limited because said arrangement ofFigs. 8, 9 and 10 is also capable of satisfactory use as a means for passing powdered or granular material into the aircraft stream.

In the appended claims, the reference to ftraction shall be understood as being generically descriptive of autogiros of the pusher type as well While the invention has been'described with respect to certain particular preferred examples which give satisfactory results, it will be understood by those skilled in the art after understanding the invention, that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended therefore in the appended claims to cover all such changes and modifications. I

What is claimed as new and desired to be secured by Letters Patent is:

1. In the art of distributing material from a supply thereof transported by a flying autogiro, the method which comprises passing material from such supply into the slip stream produced by the traction propeller of the autogiro, and

' utilizing the rotor of said autogiro to produce a pulsating down-draft on the slip stream and the material suspended therein, said rotor serving to flatten the slip stream and said propeller and I produce a pulsating down-draft on the slip stream and the material suspended therein, said rotor serving to flatten the slip stream and saidpropeller and rotor serving to modify the slip stream 9 I; eontaining the' suspended material so that such rial diverges'i'rom th material diverges from the direction or the autoline of flight at the giro line of flight atthe time said material'was 1nto'th e 8 1D streamied into the slip stream I 5. In the art of discharging material from a 5 3, 1 t t 1'. di t b t t l 1 3 rial diverges from thedirection 01 the'aut'ogiro e irection of the autogiro time said, material was fed 5 1 m {dis sedon an autogi 'mthe meth the method which comprises feeding material; fiiiiciffimmg causing the autogiro to my f m-such p y to the lip stream produced by along a path whjci i app xim t l parallel the traction propeller of the autogiro whereby the with the sin-race being treated and in inclined ip t eam deflects the material ene a ly in the In" relation with respect to said path so that the i nt k n y sa d slip s ream, andutilizing 1o autosiro nose is substantially higher than its the gotoriig 53311312151111; Serra-aids?! i; 1:151:32; passin' -materiai obtained from said supply in 8 .the all: stream produced bythe traction propeller and said rotor causing such material to diverg a! the autogiro. and utilizing the rotor of said from the direction 01' the autogiro line of flight at autogiro to produce a pulsating" down-draft on thg tln tsgld mzlt 'ialiwgs igidinto flail ng}: stream 15 thesli stream and the material suspended theren e ar 0 so a nga ma mm a in, sai rotor serving to flatten the slip stream supply thereof transported by a flying autogiro, .and said propeller and rotor serving to modify the zegiodlwhichcozililprifishcasusmg t1: gg; 'ntainin sus nded material so giro y a ong a pa w c appro ma mtj sfic h reii al diver ges i 'fiim the direction parallel with respect to the surface being treated 0 01' the autogiro lineof 1 flight it the time said and at a speed only slightly faster than the stallmaterial was fed into the slip stream. ing speed of the autogiro so that theautogironose ,4- n the t o ri uti ma e i from a is substantially higher than ts tail, feeding matesupply thereof transpo ted by a flying autogim, 'rial from such supply-to the slipstream produced the meflmd h 111911563 Passing material by the traction propeller of theautogiro whereby 25 V obtained from such imp the propeller slip the slip stream deflects the material generally in mm a adjacent the bottom of the thedirection taken by said slip stream andutilizautogiroi'uselase, and utilizing the rotor of said mgthe rotor of said autoglm to produce pm autosiro to produce a pulsating down-draft on tin down draft On such material Bald propel; 1 sli stream and the material suspended thereg the 5 to flatten the sup stream and brand said rotor causing such material to diver-get wai such fi f rising from the direction of the autogiro line gfflight the tail of the autogn-o 5 1d propeller at the time said material was fed into the .9 said rotorse'rving to modify the slip stream'constreflmtaining the suspended material so that such mate CERTIFICA l'E ,or'" CORRECTION. Patent No, 2,098, 7; November '9, 19 7.

froni the direction ofthe autogiro' and insert insteadthe words, and fcomma supply thereot transported by a f ying autogifrm; and that that said Lettors-Patent should be read with this 'co rr-ection therein that the same may conform tothe. record of the case in the Patent Office v Signed andsealed this-25t day or Januar A, b.1938

j i a Henry Van .Arsdale, S enl) Acting gonm issioner of Patents.-

, 9 I; eontaining the' suspended material so that such rial diverges'i'rom th material diverges from the direction or the autoline of flight at the giro line of flight atthe time said material'was 1nto'th e 8 1D streamied into the slip stream I 5. In the art of discharging material from a 5 3, 1 t t 1'. di t b t t l 1 3 rial diverges from thedirection 01 the'aut'ogiro e irection of the autogiro time said, material was fed 5 1 m {dis sedon an autogi 'mthe meth the method which comprises feeding material; fiiiiciffimmg causing the autogiro to my f m-such p y to the lip stream produced by along a path whjci i app xim t l parallel the traction propeller of the autogiro whereby the with the sin-race being treated and in inclined ip t eam deflects the material ene a ly in the In" relation with respect to said path so that the i nt k n y sa d slip s ream, andutilizing 1o autosiro nose is substantially higher than its the gotoriig 53311312151111; Serra-aids?! i; 1:151:32; passin' -materiai obtained from said supply in 8 .the all: stream produced bythe traction propeller and said rotor causing such material to diverg a! the autogiro. and utilizing the rotor of said from the direction 01' the autogiro line of flight at autogiro to produce a pulsating" down-draft on thg tln tsgld mzlt 'ialiwgs igidinto flail ng}: stream 15 thesli stream and the material suspended theren e ar 0 so a nga ma mm a in, sai rotor serving to flatten the slip stream supply thereof transported by a flying autogiro, .and said propeller and rotor serving to modify the zegiodlwhichcozililprifishcasusmg t1: gg; 'ntainin sus nded material so giro y a ong a pa w c appro ma mtj sfic h reii al diver ges i 'fiim the direction parallel with respect to the surface being treated 0 01' the autogiro lineof 1 flight it the time said and at a speed only slightly faster than the stallmaterial was fed into the slip stream. ing speed of the autogiro so that theautogironose ,4- n the t o ri uti ma e i from a is substantially higher than ts tail, feeding matesupply thereof transpo ted by a flying autogim, 'rial from such supply-to the slipstream produced the meflmd h 111911563 Passing material by the traction propeller of theautogiro whereby 25 V obtained from such imp the propeller slip the slip stream deflects the material generally in mm a adjacent the bottom of the thedirection taken by said slip stream andutilizautogiroi'uselase, and utilizing the rotor of said mgthe rotor of said autoglm to produce pm autosiro to produce a pulsating down-draft on tin down draft On such material Bald propel; 1 sli stream and the material suspended thereg the 5 to flatten the sup stream and brand said rotor causing such material to diver-get wai such fi f rising from the direction of the autogiro line gfflight the tail of the autogn-o 5 1d propeller at the time said material was fed into the .9 said rotorse'rving to modify the slip stream'constreflmtaining the suspended material so that such mate CERTIFICA l'E ,or'" CORRECTION. Patent No, 2,098, 7; November '9, 19 7.

froni the direction ofthe autogiro' and insert insteadthe words, and fcomma supply thereot transported by a f ying autogifrm; and that that said Lettors-Patent should be read with this 'co rr-ection therein that the same may conform tothe. record of the case in the Patent Office v Signed andsealed this-25t day or Januar A, b.1938

j i a Henry Van .Arsdale, S enl) Acting gonm issioner of Patents.- 

